The savanna gets a fair amount of rain, at least 20 inches a year.
They have toxic chemicals
They have thorns
A combination of the above defenses
Ants protect them
Desert
Temperate forest
Grassland
Tundra
Their territories don't overlap
They avoid each other as much as possible
They eat different foods
They all migrate in different directions
Asia
Antarctica
North America
Australia
Winter and fall
Winter and summer
Spring and summer
Dry and wet
All of the above
Having deep roots
Growing quickly
Developing fire-resistant cover